force mount external NAS drive

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Larr2000 Author

Level 1

4 points

force mount external NAS drive

I am runing OS X 10.8.4 on my iMac 20. I am using Time Capsule with an external Sysco Lynksis NAS200 storage device (2-500 Gb Western Digital) in Mirror mode. The NAS200 started showing signs of failure, so I started moving data off of the drives. I was successful in copying/moving some files, but the NAS controller is now dead, but disk utility still recognizes the volume. However, a repair and verify disk only produces the "dirve is corrupt, copy your data off" message. Disk utility, of course will not mount the drive, so I have resourted to a terminal session. Here is what I have tried so far:

1. mkdir /Volumes/NAS200

2. cd /Volumes

2. When I do an ls, the NAS200 shows up. (empty as expected)

3. mount NAS200 produces the error, "unknown special file or file system"

Is there a way to specify the file type or use a wild card to get around this? If I can mount the morrored drive, the rest of the day should be read only for a copy command. Is the right thought process?

iMac 20, Mac OS X (10.5.3)

Posted on Jul 26, 2013 6:16 PM

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Answer 1

Larr2000 Author

Level 1

4 points

Jul 27, 2013 7:38 PM in response to Larr2000

OK, Here is a terminal update.

1. After a diskutil list, I found my drive and the following command successfully mounted the drive:

diskutil mountDisk /dev/disk4

2. Since disk4 was the volume, I mounted the main partition:

diskutil mountDisk /dev/disk4s1

3. So, now I have both the Volume and main partition mounted successfully, I re-opened Apple disk utility and found that both the volume and partiiton (disk4s1) were there. Unfortunately Apple disk utility did not recognize the successful mount done in the terminal session. Maybe I have to do a restart to get the terminal mounted drives to be recognized by Apple disk utility. I'll try that next.

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Answer 2

Eric Root

Level 10

685,251 points

Jul 28, 2013 2:24 PM in response to Larr2000

There is a Mount button in Disk Utility if you can see the drive - top row 3rd or 4th from the left.

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Answer 3

Larr2000 Author

Level 1

4 points

Jul 28, 2013 3:39 PM in response to Eric Root

Yes, I did try the MOUNT button which fails to mount the drive.

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Answer 4

Larr2000 Author

Level 1

4 points

Jul 30, 2013 8:51 PM in response to Larr2000

Continuing with the previous post, I did a restart, but the drive would not mount in disk utility. Here are the diagnostics:

Verify and Repair volume “disk5s2”

Checking file systemChecking Journaled HFS Plus volume.

Checking extents overflow file.

Checking catalog file.

Missing thread record (id = 2)

Incorrect number of thread records

Checking multi-linked files.

Checking catalog hierarchy.

The volume could not be verified completely.

Volume repair complete.Updating boot support partitions for the volume as required.Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.

This error message is useless if you cannot get the drive to mount and read its contents.

Does anyone have any other suggestions? I am running out of options.

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Answer 5

Eric Root

Level 10

685,251 points

Jul 31, 2013 9:15 AM in response to Larr2000

Since you can access the drive to verify it, can you select the erase tab so you can reformat it per the last entry in the error message? Mac OS Extended (Journaled) is the normal format.

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Answer 6

Larr2000 Author

Level 1

4 points

Jul 31, 2013 11:20 PM in response to Eric Root

Thanks Eric,

There is data on the disk I do not want to erase, so since I cannot get a viable Apple Support Community solution (without erasing my data), I have taken the drive to a professional data recovery specialist that works with Mac drives.

Thanks for your help

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Answer 7

Eric Root

Level 10

685,251 points

Aug 1, 2013 9:37 AM in response to Larr2000

You are welcome.

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